The amount of stress put on an optical drive for a quick spin up, read, and spin down is so absurdly minimal that it's not even worth mentioning. The fact that your disc failed is unfortunate, but rare.
Sorry, I disagree. It's not a question of spin up or spin down the problem but repeated access to different parts of a disc. There's already enough wear and tear caused by loading on disc content when it should be cached but it's even worse if the drive has to zip from one part of the disc to another to find traces of the copy protection. This is especially the case when the protective layer starts to get worn and error correction starts to kick in. And contrary to what you're saying, the fact that protected discs don't respect standards means that they will fail earlier given the same conditions.